Klde swap

can someone pls help. i recently fitted a klde engine into my mx3 i also put in the 2.5 ecu, vaf and injectors. i kept the 1.8 inlet manifold and throttle body. the engine ran great (rapid for about 3-400 miles then when i put fuel in the car it ran total shit hold back and bogs down. do you think this is bad fuel or something more serious? any help much appreaciated.

sounds very strange
why didnt you run the intelt and throttle body, thats gonna have some effect
its only extendning a few wires to get soem of the censors to meet
although i doubt this is your problem as i know of a few klze conversions that have done this to save space

I would start by pulling codes. See what comes up, I wouldn't rule out that filling up may have coincided with another problem. Was the engine sitting long before you had it installed? Do a compression test?

When you say holds back, is it misfiring? Dizzys are crap on these cars, I think my second one is on its way out…

sorry i took so long to reply. i reset the ecu and ran fuel cleaner through and after a 100mls it ran good, but now after approx 500mls the engine is running slower and hesitant again. iam at aloose end as to what it could be. any suggestions?